os 91 fs tends to die after 20-30sec idling
I have an os91fs that works fine at high end but if i set to idle for about 20-30 seconds seems that many fuell comes to the engine and tends to sease fire or the type f plug goes cold. so i must give a litle revs every few seconds to clear the engine from fuell or to warm the plug. i tried to lean the mixture (low end)but nothing hapens.it seems that its a plug problem.i know that type f is the hotest plugs . what can i do?my prop is master air screw 14/7 and revs at 8500 .the idle is set to 2700-3000. when i conect the glow starter i have very stable idle for as log as i want at about 2500. also consider that the engine is inverted on a h9 p47.is something wrong with my engine? can i use smaller prop? with that idle it is imposible to keep the plane without moving.i thing a 13/8 prop.
thanks
Achilles